将build.gradle中的 jcenter() 改为

maven {url"http://jcenter.bintray.com"}

或者在build.gradle文件中添加

maven{ url'http://maven.aliyun.com/nexus/content/groups/public/' }
maven{ url'http://maven.aliyun.com/nexus/content/repositories/jcenter'}

相关链接 https://blog.csdn.net/lingbulei/article/details/82850448

gradle下载地址

不要用Android Studio下载gradle，无论如何都不走代理，看见它在下载就马上强行杀进程，因为关不掉的，然后用命令行指定代理，

./gradlew -DsocksProxyHost=127.0.0.1 -DsocksProxyPort=1080 tasks

只要第一次加入这个参数下载zip包，以后就会读取gradle.properties,也可以直接把这个参数加到环境变量GRADLE_OPTS里，再用./gradlew，

export GRADLE_OPTS='-DsocksProxyHost=127.0.0.1 -DsocksProxyPort=1080'

在properties里设置的代理在下载依赖时有用，但是下载gradle本身时不生效，然而，无论怎么设置，AndroidStudio也不会走代理下载gradle,包括AS设置里指定的gradle jvm opts，

gradle镜像全局配置，在gradle安装目录下新建init.gradle文件

allprojects{
    repositories {
        def ALIYUN_REPOSITORY_URL = 'http://maven.aliyun.com/nexus/content/groups/public'
        def ALIYUN_JCENTER_URL = 'http://maven.aliyun.com/nexus/content/repositories/jcenter'
        def ALIYUN_GOOGLE_URL = 'http://maven.aliyun.com/nexus/content/repositories/google'
        all { ArtifactRepository repo ->
            if(repo instanceof MavenArtifactRepository){
                def url = repo.url.toString()
                if (url.startsWith('https://repo1.maven.org/maven2')) {
                    project.logger.lifecycle "Repository ${repo.url} replaced by $ALIYUN_REPOSITORY_URL."
                    remove repo
                }
                if (url.startsWith('https://jcenter.bintray.com/')) {
                    project.logger.lifecycle "Repository ${repo.url} replaced by $ALIYUN_JCENTER_URL."
                    remove repo
                }
                if (url.startsWith('https://dl.google.com/dl/android/maven2/')) {
                    project.logger.lifecycle "Repository ${repo.url} replaced by $ALIYUN_GOOGLE_URL."
                    remove repo
                }
            }
        }
        maven {
            url ALIYUN_REPOSITORY_URL
            url ALIYUN_JCENTER_URL
            url ALIYUN_GOOGLE_URL
        }
    }
}

下载gradle慢！不是下载依赖包慢！

在gradle-wrapper.properties中将https://services.gradle.org/distributions/ 修改为 https://mirrors.cloud.tencent.com/gradle/